Dont worry. I'm 17 and dropped out in Decemeber for family reasons and I was pregnant and knew the baby and I would be better with the father in nj. Its my senior year and I would have been graduating here in June.. so i reccomend thinking about it hard! Getting a ged isnt 100% easy. But I will admit, if you are going through what I went through, getting out of school (and away from snobby b*tches) lol. So if you are 100% SURE, go for it. Sit them down and write down some understandable and good points for why dropping out would be the best option for you. Explain to them exactly how you intend on getting your GED. and actually do a little research on it before you talk to them so you have more info on it. Explain to them that dropping out doesnt mean you dont want to do anything with your life, but high school just isnt the same way it was when they went, and that actually getting your GED shows your smarter than 60% of high school graduates because only 40% of high school graduates could pass the GED test. And taking the GED is much less stressful because its on your clock. One more thing make sure they know that this is not just a decision you want because you just want to sleep in everyday. Maybe consider a part time job?
Overall, tell them that you have been considering this for a while now and after understanding all the difficulties and challenges you may face, this is what you feel is best for your future and you need to do what feels right for you. Dont rush them into a decision, let them think it through for a few days.
p.s. - just because your considered a "high school dropout" doesnt mean your stupid, I dropped out and was in the top 10% of my graduating class. But sometimes stress can overrule grades and class. You wont learn anything if you truely dont want to be there..